Terri Irwin, widow of the late crocodile hunter Steve Irwin, and Paul
Watson aboard the Sea Shepherd flagship in Melbourne in 2007. Photograph:
William West/AFP

"Eco-pirate" Paul Watson is losing a race against time to recover
his flagship boat, the Steve Irwin, which has been impounded in
Shetland.

The world's most radical conservationist, Watson is
being sued for $1.4m (�850,000) by a Maltese fishing company, Fish
and Fish, one of Europe's leading tuna processors. The law suit
against Watson's Sea Shepherd Conservation Society was filed last
year after activists aboard the Steve Irwin freed 800 bluefin tuna
from a pen in the Mediterranean.

Watson has just 10 days to
raise the bond required to release the boat, which was named after
the late Australian conservationist. It has been impounded in the
harbour at Lerwick ever since the company sued him for damages. By
last night, the society had raised about $500,000, after a global
Twitter campaign and appeals to celebrities who have helped Watson
in the past.

A co-founder of Greenpeace, Watson was picking
up volunteer crew and restocking the Steve Irwin in preparation for
a trip to protest against whaling in the Faroe Islands when he was
served with the writ. The tuna cage that had been intercepted 40
miles off the Libyan coast in June last year held an estimated 35
tons of fish.

After a fracas in which there was hand-to-hand
fighting between the two crews, Sea Shepherd sent in divers to
release the 800 tuna.

Joseph Caruana, the owner of Fish and
Fish, declined to speak to the Observer, but has claimed in the
Maltese press that two of his divers were injured in the encounter,
an allegation strongly denied by Watson. "Sea Shepherd cannot
continue behaving this way. My aim is for justice to be done. I
wanted to show that we mean business and we will fight our cause,"
he said.

Malta has become a global capital of tuna fishing,
exporting �80m-worth of the fish, mainly to the Middle East and
Japan. Ships surround the fish with nets and then tow them to cages,
where they are fattened for export.

Catches are limited to
two weeks a year and ship owners have been given strict quotas to
meet by governments, but, with little policing, the industry has
been able to openly flout the law in Libyan waters.

Greenpeace and
WWF called last month for a suspension of the Mediterranean tuna
fishing season, saying that stocks were at critically low levels.
"Mediterranean bluefin tuna is on the slippery slope to collapse,"
said Dr Sergi Tudela, of WWF Mediterranean.

In a statement
last week, Watson said that if Sea Shepherd could not raise the
money, the Steve Irwin could be held indefinitely and possibly sold.
"This would not only be a financial hardship, but it could threaten
our ability to defend whales in the Southern Ocean Whale Sanctuary
from the Japanese whaling fleet this December. Fish and Fish are
claiming damages for bluefin tuna we believe were illegally caught
after the season had closed," he said.

In a separate
incident, the Namibian government has declared Sea Shepherd a
"threat to national security" after it tried to film the annual
slaughter of 90,000 Cape fur seals on the west African coast. It is
a crime to document seal clubbing in Namibia.

"The group tried to document the seal slaughter,
but was detected by Namibian special forces," said Watson. "It was a
good plan, but Sea Shepherd is no match for the Namibian military."
The group fled to South Africa, having had its rooms burgled and
cameras destroyed.